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RxNorm API

Search RxNorm clinical drugs and ingredients, look up RxCUIs and map to NDCs. NLM RxNorm Current Prescribable Content, refreshed monthly.
Source
U.S. National Library of Medicine
Updated
Monthly
License
No license required (Current Prescribable Content)
Live version
2026-10-05
Request
GET /v1/drugs/rxnorm/861007
200 OK · application/json
{
  "data": {
    "rxcui": "861007",
    "name": "metformin hydrochloride 500 MG Oral Tablet",
    "tty": "SCD",
    "ingredients": [
      {
        "rxcui": "6809",
        "name": "metformin"
      }
    ]
  },
  "meta": {
    "source": "nlm-rxnorm",
    "data_version": "2026-10-06"
  }
}

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About the data

RxNorm

RxNorm gives every clinical drug a normalized name and a concept id (RxCUI), and links brand and generic forms, ingredients and NDCs. It is the common language for e-prescribing and drug data.

healthcare.dev serves the RxNorm Current Prescribable Content subset, which NLM publishes without licensing restrictions. This product uses publicly available data from the U.S. National Library of Medicine (NLM), National Institutes of Health, Department of Health and Human Services; NLM is not responsible for the product and does not endorse or recommend this or any other product.

Source: U.S. National Library of Medicine. Full field reference in the docs.

Endpoint
/v1/drugs/rxnorm/{rxcui}
Source id
nlm-rxnorm
Cadence
Monthly
License
No license required (Current Prescribable Content)

Questions

RxNorm API FAQ

What is an RxCUI?
The RxNorm concept unique identifier. Each clinical drug, branded drug and ingredient has one.
Which RxNorm release do you serve?
The Current Prescribable Content subset, updated monthly. data_version on every response names the release.